一种柔性隔振结构的动力学分析及设计方法  

DESIGN AND DYNAMIC ANALYSIS OF A FLEXIBLE VIBRATION ISOLATION STRUCTURE

作　　者：尹佑旺 郑佩[1] Yin Youwang;Zheng Pei(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院学院,上海200093

出　　处：《动力学与控制学报》2021年第6期16-24,共9页Journal of Dynamics and Control

摘　　要：本文提出了一种新型的柔性隔振结构,该结构是基于柔性曲梁的力学特性而设计的.研究结果表明,该结构能通过轴向方向的负载来降低扭转方向的刚度,从而达到扭转方向的准零刚度特性,实现低频隔振.本文首先构建了柔性隔振结构的单元模型,并确定了单元模型轴向及扭转方向等关键静力特性,结果表明,该结构的单元模型能实现扭转方向的准零刚度特性,且轴向方向有较高的负载.然后,对不同结构参数的单元模型进行了动力学分析,确定了各结构参数对该结构动力学特性的影响,并利用有限软件对其进行了仿真分析,结果表明,该单元模型具有较好的隔振效果.最后,对构建的多层仿生柔性结构的隔振效率及隔振带宽进行了探讨.该结构具有柔性机构免装配、可整体加工、易小型化等特点,适用于精密光学仪器、机器人、卫星等具有扭转方向低频隔振的领域.This paper presents a new flexible vibration isolation structure based on mechanical properties of flexible curved beams.The results show that the structure can reduce the torsional stiffness through axial load,thus achieving quasi-zero stiffness characteristic in the torsional direction and realizing low frequency vibration isolation.In this paper,a element model of the flexible vibration isolation structure is first constructed,and key static characteristics of the element model,such as axial and torsional directions,are determined.The results demonstrate that the element model of can realize quasi-zero stiffness characteristics in the torsional direction and has a high load-carrying ability in the axial direction.Then,the dynamic analysis of the element model with different structural parameters is carried out,with the influence of the structural parameters on the dynamic characteristics being determined,and finite element software is used for a simulation study.The results show that the element model has a good vibration isolation performance.Finally,the vibration isolation efficiency and bandwidth of the multi-layer bionic flexible structure are discussed.The structure has the characteristics of free assembly of flexible mechanism,integral processing,easy miniaturization and so on.It is suitable for precision optical instrument,robot,satellite and other fields with low frequency vibration isolation in torsion direction.

关 键 词：准零刚度 柔顺性结构 被动隔振 

分 类 号：TB535.1[理学—物理]